Table 2.

Identification of SLE by attributed cause of ESRD in the USRDS combined with inpatient diagnostic codes, among Georgia Lupus Registry (GLR) patients who initiated treatment for ESRD (through 2012) and were subsequently hospitalised

Identification of patients with SLE by	No of patients with SLE identified in USRDS	No of patients with SLE progressing to ESRD, with subsequent hospitalisation data	Attribution to SLE (95% CI)
CMS-2728 only	150	196	76.5% (70.0% to 82.3%)
CMS-2728 or ICD-9 code (710.0) in two or more hospitalisations ≥30 days apart	178	196	90.8% (85.9% to 94.5%)
CMS-2728 or ICD-9 code (710.0) in at least one hospitalisation	188	196	95.9% (92.1% to 98.2%)

CMS-2728, Centers for Medicare & Medicaid Services ESRD Medical Eligibility Form 2728; ESRD, end-stage renal disease; ICD-9, International Classification of Diseases V.9; SLE, systemic lupus erythematosus; USRDS, United States Renal Data System.